Contents  on 18 April '17

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. To keep track of what's new each day, watch the Chronology section.

Traffic Report  on 18 April '17

Three objects reported inside ten LD

There are three asteroidal objects reported to be inside ten lunar distances (LD) of our home planet today. Radar target 2014 JO25 enters our ten-LD traffic reporting "bubble," zooming in from 12.32 to 6.01 LD, NHATS target 2017 FT102 is outbound from 7.19 to 7.68 LD, and, initially the closest, newly discovered risk-listed intruder 2017 HJ is moving away from 5.90 to 9.24 LD. After newly announced 2017 HD comes into the bubble tomorrow, we can look forward to whatever further discoveries and to radar target 2017 CS, which will enter on May 26th.

Earth passage I D ~Size Distance Today  Notes
0.35 LD April 162017 HJ 11 m  5.90 to 9.24 LD NEW, intruder, risk - MPEC
1.05 LD April 32017 FT102 4 m  7.19 to 7.68 LD NHATS target
4.57 LD tomorrow2014 JO25 812 m  6.01 from 12.32 LD enters ten LD, radar target - DOU
Approaching
3.77 LD April 222017 HD 14 m  < 10 LD tomorrow, NEW - MPEC
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU

This report was updated at 2316 UTC with five discoveries. Besides the two noted, there are three already departed objects: 2017 HG (MPEC), which flew past us at 4.30 LD on April 13th, 2017 HF (MPEC), at 2.92 LD on April 9th, and 2017 HE (MPEC), at 2.91 LD on April 10th.
        Your first local asteroids traffic report was generated at 1716 UTC with follow-up for 2017 CS in today's DOU MPEC along with the recovery of 2014 JO25, which will safely pass us at 4.57 LD tomorrow noon UTC. This is a notably close passage for an object of this size (see links), which is estimated from its visual brightness, using a standard formula, to be roughly 800 meters in diameter, but from infrared observation is put at 650 meters.

Note:  JPL HORIZONS System News posted an alert yesterday that "The 'ssd.jpl.nasa.gov' and 'neo.jpl.nasa.gov' computers may be down for up to 48 hours due to maintenance." This includes the new CNEOS Web site, but at A/CC we have not yet noticed any disruption of the services that we use regularly.



Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting on transient natural objects that approach the actually significant gravitational sphere of influence (SOI), which has a radius of about 2.41 LD from Earth's center. This puts a focus on some of the most important and very best NEO observation work, representative of the much larger NEO discovery and tracking effort. Object distances are derived by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

Radar Astrometry  on 18 April '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2030 UTC when the database was dated 18 April

NEOCP Activity  on 18 April '17

The MPC's NEO Confirmation Page has 38 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 38 objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 66 listings on the NEOCP today.

New MPECs  on 18 April '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been eleven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-H17 - "19:53 UT" - 2017 HD


MPEC 2017-H16 - "19:50 UT" - 2017 HJ


MPEC 2017-H15 - "19:47 UT" - 2017 HH


MPEC 2017-H14 - "19:44 UT" - 2017 HG


MPEC 2017-H13 - "19:40 UT" - 2017 HF


MPEC 2017-H12 - "19:37 UT" - 2017 HE


MPEC 2017-H11 - "19:30 UT" - 2017 GB8


MPEC 2017-H10 - "19:27 UT" - 2017 GA8


MPEC 2017-H09 - "19:24 UT" - 2017 GZ7


MPEC 2017-H08 - "13:31 UT" - 2005 GO59


<< DOU on 18 Apr. '17 >>  MPEC 2017-H07 - "12:01 UT" - Daily Orbit Update

Observers  on 18 April '17

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-H09 -- 2017 GZ7
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-H11 -- 2017 GB8
251Arecibo in Puerto Rico, 1 in radar -- 215588
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPEC 2017-H07 -- 2017 GM4, 2017 GK4, 2017 FO128, 90075, 54789, 475665, 474231, 220124, 143404, 137170, 11398, 4954, 2329, 1036
T08ATLAS Mauna Loa in Hawaii, 5 in MPECs 2017-H07 & 2017-H11 -- 2017 GB8, 2017 AC5, 163696, 11398, 4055
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-H11 -- 2017 GB8
703Catalina Sky Survey (CSS) in Arizona, 26 in MPECs 2017-H07 & 2017-H11 -- 2017 GB8, 2017 FH101, 2017 FE1, 2017 DT37, 2016 GH135, 2012 HN8, 2011 ED78, 483560, 474231, 39796, 34613, 252793, 220124, 163696, 159560, 154652, 143404, 138359, 138155, 136582, 10636, 5653, 4179, 3352, 3103, 2329
107Cavezzo Obs. in Italy, 1 in MPEC 2017-H11 -- 2017 GB8
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-H09 -- 2017 GZ7
K65Cesena Obs. in Italy, 1 in MPEC 2017-H15 -- 2017 HH
958Dax Obs. in France, 4 in MPECs 2017-H11, 2017-H13, 2017-H15 & 2017-H16 -- 2017 HJ, 2017 HH, 2017 HF, 2017 GB8
203GiaGa Obs. in Italy, 2 in MPECs 2017-H11 & 2017-H13 -- 2017 HF, 2017 GB8
K88GINOP-KHK in Hungary, 3 in MPECs 2017-H11, 2017-H12 & 2017-H13 -- 2017 HF, 2017 HE, 2017 GB8
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 215588
J95Great Shefford Obs. in England, 4 in MPECs 2017-H07, 2017-H11, 2017-H14 & 2017-H16 -- 2017 HJ, 2017 HG, 2017 GB8, 2014 JO25
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2017-H11 -- 2017 GB8
Q60ISON Siding Spring Obs. in New South Wales, 1 in MPEC 2017-H07 -- 2000 AF205
K92LCOGT Sutherland B in South Africa, 1 in MPEC 2017-H16 -- 2017 HJ
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-H09 -- 2017 GZ7
118Modra Obs. in Slovakia, 1 in MPEC 2017-H07 -- 5604
G96Mt. Lemmon Survey (MLS) in Arizona, 28 in MPECs 2017-H07, 2017-H10, 2017-H11, 2017-H12, 2017-H13, 2017-H14, 2017-H15, 2017-H16 & 2017-H17 -- 2017 HJ, 2017 HH, 2017 HG, 2017 HF, 2017 HE, 2017 HD, 2017 GV6, 2017 GQ5, 2017 GB8, 2017 GA8, 2017 FQ64, 2017 FH101, 2017 FD65, 2017 ED3, 2015 KN120, 2015 FF37, 2013 RM43, 2012 QF49, 2012 HN8, 2012 EY11, 2003 FR6, 85275, 479325, 144898, 7480, 7474, 5189, 2329
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-H11 -- 2017 GB8
C23Olmen Obs. in Belgium, 2 in MPECs 2017-H07 & 2017-H11 -- 2017 GB8, 143404
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2017-H09 & 2017-H15 -- 2017 HH, 2017 GZ7
K63Pascoli Obs. in Italy, 3 in MPECs 2017-H11, 2017-H15 & 2017-H16 -- 2017 HJ, 2017 HH, 2017 GB8
B49Paus Obs. in Spain, 1 in MPEC 2017-H11 -- 2017 GB8
D29Purple Mtn. Obs. Xuyi Station in China, 14 in MPECs 2017-H07 & 2017-H08 -- 2013 CL118, 2005 GO59, 2005 GB120, 2003 FR6, 2000 AF205, 1998 HK1, 413002, 388838, 370307, 205378, 154652, 10636, 7358, 4055
W25RMS Obs., 5 in MPECs 2017-H07, 2017-H10 & 2017-H11 -- 2017 GB8, 2017 GA8, 2017 CS, 260141, 138155
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-H11 -- 2017 GB8
H36Sandlot Obs. in Kansas, 2 in MPECs 2017-H11 & 2017-H15 -- 2017 HH, 2017 GB8
B74Santa Maria de Montmagastrell Obs. in Spain, 2 in MPECs 2017-H13 & 2017-H15 -- 2017 HH, 2017 HF
Y00SONEAR in Brazil, 1 in MPEC 2017-H11 -- 2017 GB8
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2017-H07 -- 2016 MK1, 2012 HN13, 2012 EY11
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2017-H07, 2017-H09 & 2017-H10 -- 2017 GZ7, 2017 GA8, 2016 VV3
I93St. Pardon de Conques Obs. in France, 5 in MPECs 2017-H10, 2017-H11, 2017-H13, 2017-H14 & 2017-H16 -- 2017 HJ, 2017 HG, 2017 HF, 2017 GB8, 2017 GA8
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-H16 -- 2017 HJ
926Tenagra II Obs. in Arizona, 5 in MPECs 2017-H08, 2017-H10, 2017-H11, 2017-H14 & 2017-H16 -- 2017 HJ, 2017 HG, 2017 GB8, 2017 GA8, 2005 GO59
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-H07 -- 2016 SM3
C51WISE in Earth polar orbit, 4 in MPEC 2017-H07 -- 53319, 474549, 323179, 322966
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 April '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the NASA/JPL Sentry and NEODyS CLOMON2 risk pages.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2017 HJJPL Sentry22322070-2114184.11188e-06-6.68-7.480JPL: Computed at 15:20 today Pacific time based on 37 observations spanning .80313 days (2017-Apr-17.42568 to 2017-Apr-18.22881). Diameter approximately 0.011 km. from weighted mean H=27.45.
2017 FO128JPL Sentry15552104-210961.66503868e-05-3.69-3.710JPL: Computed at 08:06 today Pacific time based on 56 observations spanning 17.081 days (2017-Mar-30.26183 to 2017-Apr-16.34269). Diameter approximately 0.110 km. from weighted mean H=22.45.
2016 UB26JPL Sentry02312066-206611.174e-08-7.71-7.710JPL: Computed at 18:48 April 17th Pacific time based on 33 observations spanning 4.7936 days (2016-Oct-22.31089 to 2016-Oct-27.10449). Diameter approximately 0.034 km. from weighted mean H=24.96.
2016 SK2JPL Sentry15552073-208252.210504e-06-5.85-5.880JPL: Computed at 01:54 today Pacific time based on 30 observations spanning 31.977 days (2016-Sep-25.12674 to 2016-Oct-27.103638). Diameter approximately 0.029 km. from weighted mean H=25.31.
2015 FN36JPL Sentry03362117-211712.262e-09-8.14-8.140JPL: Computed at 19:42 April 17th Pacific time based on 42 observations spanning 31.129 days (2015-Mar-23.21978 to 2015-Apr-23.348497). Diameter approximately 0.056 km. from weighted mean H=23.91.
2013 VJ13JPL Sentry05162099-209911.977e-09-8.19-8.190JPL: Computed at 20:42 April 17th Pacific time based on 51 observations spanning 35.929 days (2013-Nov-01.309556 to 2013-Dec-07.23885). Diameter approximately 0.060 km. from weighted mean H=23.75.
2010 GZ60JPL Sentry23262017-21164815.4254619e-06-0.76-1.750JPL: Computed at 13:26 today Pacific time based on 14 observations spanning 1.2571 days (2010-Apr-05.71913 to 2010-Apr-06.97621). Diameter approximately 2.000 km. from weighted mean H=16.14.
2008 USJPL Sentry02312017-2069311.57415251e-05-6.03-6.270JPL: Computed at 14:44 April 7th Pacific time based on 15 observations spanning .08144 days (2008-Oct-21.35391 to 2008-Oct-21.43535). Diameter approximately 0.002 km. from weighted mean H=31.43.
2006 WVJPL Sentry05162103-210312.905e-08-8.70-8.700JPL: Computed at 21:31 April 17th Pacific time based on 84 observations spanning 3.9270 days (2006-Nov-17.35564 to 2006-Nov-21.282629). Diameter approximately 0.013 km. from weighted mean H=27.11.

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale (next 100 years)

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology  on 18 April '17

Times are UTC for when items were noted or added by The Tracking News.

2326Noted that JPL Sentry has reposted 2010 GZ60 as an impact risk - see above
2316Updated Traffic Report
2232Noted that JPL Sentry has posted 2017 HJ as an impact risk - see above
2030Noted Radar Astrometry database update - see above
2004Grabbed MPEC 2017-H11 - 2017 GB8 - see above
Grabbed MPEC 2017-H12 - 2017 HE - see above
Grabbed MPEC 2017-H13 - 2017 HF - see above
Grabbed MPEC 2017-H14 - 2017 HG - see above
Grabbed MPEC 2017-H15 - 2017 HH - see above
Grabbed MPEC 2017-H16 - 2017 HJ - see above
Grabbed MPEC 2017-H17 - 2017 HD - see above
1931Grabbed MPEC 2017-H09 - 2017 GZ7 - see above
Grabbed MPEC 2017-H10 - 2017 GA8 - see above
1555Noted that JPL Sentry has updated its 2016 SK2 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FO128 risk assessment - see above
Grabbed MPEC 2017-H07 - Daily Orbit Update - see above
Grabbed MPEC 2017-H08 - 2005 GO59 - see above
0516Noted that JPL Sentry has reposted 2006 WV as an impact risk - see above
Noted that JPL Sentry has updated its 2013 VJ13 risk assessment - see above
0336Noted that JPL Sentry has reposted 2015 FN36 as an impact risk - see above
0231Noted that JPL Sentry has updated its 2008 US risk assessment - see above
Noted that JPL Sentry has reposted 2016 UB26 as an impact risk - see above